356 FORAMINIFERA OF THE CRAG. 



Polystomella ceispa, var. Poeyana, Goes, 1882. K. Sv. Vet.-Akad. Handl., 



vol. xix. No. 4, p. 116, pi. viii, figs. 

 301, 302. 



— Jones, 1883. Micr. Diet., edit. 4, p. 623, pi. xxiii, fig. 55 ; 



pi. xxiv, figs. 20 a, b. 



— — West, 1883. J. Post. M. S., vol. ii [5], p. 41, pi. xxi, 



figs. 1—3. 



— — Brady, 1884. ' Challenger' Eep., p. 736, pi. ex, figs. 6, 7. 



— — Basset, 1884. Ann. Soc. Sci. Nat, Char.-Inf., No. 21, 



p. 162, fig. 45. 



— Giimbel, 1886. Geol. Bayern., vol. i, pt. 2, p. 421, 



fig. 266 25 . 



— — Hogg, 1886. Microsc., p. 375, fig. 207 3 . 



— — Fornasini, 1887. Boll Soc. Geol. Ital., vol. v, pp. 142, 158 



—160. 



— — Brady, 1887. Journ. E. Micr. Soc, p. 926. 



— — Steinmann, 1888. Elem. Pal., vol. i, p. 32, fig. 17 a. 



— elexttosa, Walther, 1888. Mitth. Zool. Stat. Neapel, vol. viii, 



pp. 382, 383, pi. xx, fig. 5. 



— ceispa, Prestwich, 1888. Geology, vol. ii, p. 420, fig. 210 a. 



— [Chapman}, 1888. Scient. News, May, p. 413, fig. 18. 



— — Verworn-, 1888. Zeit. Wiss. Zool., vol. xlvi, p. 462, pi. 



xxxii, figs. 7, 8, 9, and g, h, i ; Ann. Mag. Nat. 

 Hist., ser. 6, vol. ii, p. 161, pi. ix ; figs. 4 — 6. 



— — Terrigi, 1891. Mem. Descriz. Carta Geol. d'ltalia, vol. iv, 



p. 110. 



— — Fgger, 1893. Abh. k. Bayer. Ak. Wiss., vol. xviii, p. 432, 



pi. xx, figs. 20, 21. 



— -De Amicis, 1893. Boll. Soc. Geol. Ital., vol. xii, p. 460. 



— A. Silvestri, 1893. Atti Bed. Ace. Zelanti Acireale, vol. v, 



p. 21, pi. iii, figs. 28, 29. 



— — Goes, 1894. K. Sven. Vet.-Ak. Handl., vol. xxv, No. 9, 



p. 102, pi. xvii, figs. 820—822. Pig. 822 is a 

 thick-edged form, like our figs. 42, 43. 



— — Fornasini, 1894. Poram. Coll. Sold., Sagg. Oritt., pp. 9 — 



11, and 21. 



Characters. — Shell lenticular, spiral, showing only the outermost convolution, 

 which consists of numerous narrow, arcuate, flexuose segments. Anterior border 

 of each segment prominent, smooth, forming a raised septal line — the central 

 portion and posterior border more depressed, sometimes concave ; sculptured into 

 numerous transverse crenulations, most conspicuous near their junction with the 

 preceding segment. Peripheral margin thin, sometimes carinate, occasionally 

 furnished with tubercular or spinous processes projecting from the septal ridges. 

 Apertures numerous, arranged in a A-shaped series, close to the surface of the 

 antecedent convolution. 



